Commutator-slotter.



F. R. ALLEY.

COMMUTATOR SLOTTER.

APPLICATION FILED MAY 28, 1913.

1,083,175. Patented Dec. 30, 1913.

WITNESSES Fun/79 172 12 9% By J M A770R/VEY8 CDLUMBIA PLANOGRAPH 130.,WASHINGTON. D. c.

FRANK RUSSELL ALLEY, OF SEATTLE, WASHINGTON.

COMMUTATOR-SLOTTER.

Specification of Letters Patent.

Application filed May 28, 1913.

Patented Dec. 30, 1913. Serial No. 770,349.

To all whom it may concern:

Be it known that I, FRANK RUssnLL AL- LEY, a citizen of the UnitedStates, and a resident of Seattle. in the county of King and State ofVashington, have invented a new and Improved Commutator-Slotter, ofwhich the following is a full, clear, and eX- act description.

This invention relates to a hand tool for slotting commutators, and ithas for its general object to provide an improved tool of comparativelysimple and inexpensive construction whereby the slots between thecommutator bars of a dynamo electric machine can be quickly andaccurately made and with uniformly good results.

- Another object of the invention is the provision of a tool embodying aguide and a cutter so related with respect to each other that the cuttercan operate between two commutator bars while the guide is en gaged in aslot already formed between two other commutator bars, said guideserving to enable a slot to be started, and thereafter the tool istilted to throw the guide out of its slot for enabling the cutter toperform its work of cutting a slot by the reciprocation of the tool, andthe guide and cutter can be thrown into or out of parallelism as thecondition of the commutator may require.

Another object of the invention is the pro-- vision of novel adjustingmeans on the body of the tool whereby the guide and cutter can be spacedapart any desired distance for enabling slots to be cut in thecommutator at widely spaced points where only a few slots can be cut atany one time while the machine is idle, an additional group of slotsbeing cut at another time, and so on until the commutator is completed.In this manner the commutator may be kept absolutely true, which wouldnot be the case if a group of slots were cut at one side of thecommutator at one time and another group at another time, and so on.

With these objects in view, and others as will appear as the descriptionproceeds, the invention comprises various novel features of constructionand arrangement of parts which will be more fully described hereinafterand set forth with particularity in the claims appended hereto.

In the accompanying drawings, which illustrate one embodiment of theinvention, and wherein similar reference characters are employed todesignate corresponding parts throughout the several views, Figure 1 isa plan view of the tool with a portion broken away; Fig. 2 is a sideview with a portion in section on the line 2-2 of Fig. 1; Fig. 3 is atransverse section on the line 33 of Fig. 1; and Fig. A is a side viewof the guide detached.

Referring to the drawing, A designates the body of the tool, which bodyis an aluminum or other metal casting that is formed withtransversely-disposed parallel slots 1 and 2, in which are slidablymounted posts 3 and 4:, respectively, said posts extending below thebottom of the body A and each formed with a dove-tailed slot to formjaws 5 for receiving a cutter which is preferably, although notnecessarily, a triangular file 6 that is clamped in place by set-screws7 in the jaws. This cutter extends parallel with the longitudinal edgesof the body and is parallel with a guide 8 which is in the form of aplate or bar having at its lower edge alining groove-engaging runners 9.This plate has four openings or slots 10 for receiving screws 11 whichare threaded in openings 12 in the side of the body A. By looseningthese screws the guide 8 can be adjusted up or down so as to adapt thetool for commutators of different curvatures.

The cutter 6 and guide 8 are relatively adjustable toward and from eachother so that the tool can span a plurality of commutator bars. For thisadjustment the posts 3 and c are slidable in their respective guidewaysor grooves 1 and 2, each post having an adjusting screw 13 swiveled at 11 in the wall or portion of the body adjacent the guide 8, the oppositeend of the screw being formed with a milled head or knob 15 whereby thescrew can be readily turned. The screw is threaded in an opening 16 inthe cutter-carrying post and after the posts are properly adjustedaccidental change in the adjust ment is prevented by set-screws 17 ineach post binding on the screw 13, there being a spring washer 18inserted between the heads of the screws 17 and the plate 19 whichslidably engages the top surface of the body A.

In using the tool the mica between two bars of the commutator is cutaway by the file 6 without making use of the guide 8. In cutting thesecond groove, however, the cut is guided by the guide 8 being enteredin the first groove, whereby the tool is reciprocated back and forth ina straight line. After the groove has been well started the tool istilted slightly so as to disengage the guide from the first slot Whilethe second slot is completed. The third slot is begun by placing thetool in such a position that the guide will engage the second slot andthe operation just described is repeated. In this manner the operationis continued until all the slots between the commutator bars are made.

lVith a tool of this character it will be found that a slot can be madeby hand in less than a minute and better results obtained with lessliability of injuring the surface of the commutator, than with othermethods, such as hand filing, scraping or sawing, which take from fourto seven minutes to make a slot, and then there is danger of injuringthe surface of the commutator.

It will be noted that the ends of the file or cutter can beindependently adjusted to throw it out of parallelism with the guide, aswill be necessary when the bearing end of the commutator is smaller thanthe armature end, which condition of the commutator has been broughtabout by truing the commutator from time to time with sandpaper or witha grinding machine, as is sometimes done.

From the foregoing description taken in connection with the accompanyingdrawings, the advantages of the method of operation and of the deviceshown will be readily understood by those skilled in the art to whichthe invention appertains, and while I have described the device which Inow co-nsider to be the best embodiment thereof, I

desire to have it understood that the device shown. is merelyillustrative, and that such changes may be made when desired as arewithin. the scope of the appended claims.

Having thus described my invention, I

l claim as new and desire to secure by Letters Patent:

1. A commutator slotting tool comprising a body havingtransversely-extending guideways disposed parallel and spaced apart, asingle rotating element in each guideway, a member engaged with eachelement and moved longitudinally thereof by rotation of the elements, acutter mounted on the members and disposed below the same and below thebody, and a guide adjustably mounted on the body and extending.substantially parallel with the cutter.

2. A commutator slotter comprising a rectangular body having at one endparallel transverselyextending guideways, a screw rotatable in eachguidewa-y, a member movable in each guideway and connected with thescrew, a cutter mounted in each member and having its ends extendingbeyond the ends of the body, and a guide on one side of the cutter andadjustable vertically to vary the relation of the guide to the cutter.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANK RUSSELL ALLEY.

Witnesses:

Max RAGLEY, HERBERT BRAUN.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. G."

